"taller soldiers are more likely to survive battle and that taller parents are more likely to have sons". This was based on his research of British Army records from the First World War, which showed that "surviving soldiers were on average more than one inch (3.33 cm) taller than fallen soldiers"
I was thinking that the taller men were recruited to the army first, while the rest didn't leave home at all. But eventually everyone would've joined I suppose.
"taller soldiers are more likely to survive battle and that taller parents are more likely to have sons". This was based on his research of British Army records from the First World War, which showed that "surviving soldiers were on average more than one inch (3.33 cm) taller than fallen soldiers"
[1] https://en.m.wikipedia.org/wiki/Returning_soldier_effect